The Pantry, one of the nation's largest gasoline retailers, posted profit of $23 million in its fiscal fourth quarter ended Sept. 25, four times the profit of the year-ago period, the newspaper noted. Ben Brownlow, an analyst at Morgan Keegan & Co., expects even better results for the current quarter.

"We're happy, our customers are happy," Jinger Duryea, president of C.N. Brown, which owns 108 gas stations in Maine and New Hampshire, said. "It's not costing as much to buy the product and store the product."

While most people think retailers clean up when prices rise and get pinched when they drop, the opposite is true, the newspaper noted. When prices soared last spring, demand sank and stations couldn't pass along the entire increase in their wholesale costs.

Gross profit margins—the difference between wholesale and retail prices after taxes and freight—averaged about 9 cents a gallon vs. a typical 14 cents.

And with stratospheric gas prices, retailers' credit card fees, typically 2.5 percent of sales, were 10 cents a gallon, USA Today reported. Add to that rent and labor, and most retailers broke even or lost money on gas, though many offset that with convenience-store profits. The Pantry had a $5.1 million loss in the second quarter.

Sinking prices also bolster store sales. Some customers don't fill up, believing prices will fall further, and make more trips to the pump. "That's one more time a week the customer comes by to get coffee or a sandwich," Jeff Lenard, National Association of Convenience and Petroleum Retailing (NACS), told the newspaper.